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@ARTICLE{Esat:1041553,
      author       = {Esat, Taner and Ternes, Markus and Temirov, Ruslan and
                      Tautz, Frank Stefan},
      title        = {{E}lectron spin secluded inside a bottom-up assembled
                      standing metal-molecule nanostructure},
      publisher    = {arXiv},
      reportid     = {FZJ-2025-02310},
      year         = {2023},
      abstract     = {Artificial nanostructures, fabricated by placing building
                      blocks such as atoms or molecules in well-defined positions,
                      are a powerful platform in which quantum effects can be
                      studied and exploited on the atomic scale. Here, we report a
                      strategy to significantly reduce the electron-electron
                      coupling between a large planar aromatic molecule and the
                      underlying metallic substrate. To this end, we use the
                      manipulation capabilities of a scanning tunneling microscope
                      (STM) and lift the molecule into a metastable upright
                      geometry on a pedestal of two metal atoms. Measurements at
                      millikelvin temperatures and magnetic fields reveal that the
                      bottom-up assembled standing metal-molecule nanostructure
                      has an $S = \frac{1}{2}$ spin which is screened by the
                      substrate electrons, resulting in a Kondo temperature of
                      only $291 \pm 13$ mK. We extract the Landé $g$-factor of
                      the molecule and the exchange coupling $Jρ$ to the
                      substrate by modeling the differential conductance spectra
                      using a third-order perturbation theory in the weak coupling
                      and high-field regimes. Furthermore, we show that the
                      interaction between the STM tip and the molecule can tune
                      the exchange coupling to the substrate, which suggests that
                      the bond between the standing metal-molecule nanostructure
                      and the surface is mechanically soft.},
      keywords     = {Mesoscale and Nanoscale Physics (cond-mat.mes-hall) (Other)
                      / Strongly Correlated Electrons (cond-mat.str-el) (Other) /
                      FOS: Physical sciences (Other)},
      cin          = {PGI-3},
      cid          = {I:(DE-Juel1)PGI-3-20110106},
      pnm          = {5213 - Quantum Nanoscience (POF4-521)},
      pid          = {G:(DE-HGF)POF4-5213},
      typ          = {PUB:(DE-HGF)25},
      doi          = {10.48550/ARXIV.2301.11762},
      url          = {https://juser.fz-juelich.de/record/1041553},
}